18. Is the first part in the digestive system composed of teeth and the tongue?
A. mouth B. stomach C. esophagus D. lungs
19. Is a long muscular tube that connects the pharynx to the throat to the stomach?
A. mouth B. stomach C. esophagus D. small intestines
20. Which organ system is responsible for eliminating wastes from the body?
A. Digestive System
B. Integumentary System
C. Nervous System
D. Excretory System
21. Which is the main excretory organ in the body?
D. Urethra
A. Kidneys
B. Ureter
C. Urinary bladder
22. Which is the amazing organ that performs different functions such as processing memon
judgement, and reasoning?
D. brainstem
C. brain
B. cerebrum
A. Spinal cord​